<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      div {
        width: 200px;
        height: 200px;
        background-color: blue;
      }
    </style>
  </head>
  <body>
    <!-- 运用定时器，让 div 一秒后移动 -->
    <div></div>
    <script>
      setTimeout(function () {
        var div = document.querySelector('div')
        var time = 0
        setInterval(function () {
          time++
          div.style.left = time + 'px'
        }, 500)
      }, 1000)
    </script>
  </body>
</html>
